Long-Term Debt (Credit Facility End of Period Disclosures Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2014 item
Credit Facility, Name [Member] | Credit Facility, Type of Debt [Member]
Debt Instrument [Line Items]
Minimum Number of Additional Tranches Available in Future	1
Aggregate Principal Amount of Each Tranche Available in Future	$ 1,500,000,000
Debt, Weighted Average Interest Rate	4.40%
Credit Facility, Revolving Credit Loans [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	1,000,000,000
Letters of Credit Outstanding, Amount	$ 83,000,000